An occlusal contact analysis of lateral mandibular movement using T-Scan system

Joo-Hun Song; Se-Jin Joo; Ho-Sun Lee; Dong-Wan Kang; Gyeong-Je Lee

doi:10.4047/jkap.2015.53.2.128

Journal List > J Korean Acad Prosthodont > v.53(2) > 1034819

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Song, Joo, Lee, Kang, and Lee: An occlusal contact analysis of lateral mandibular movement using T-Scan system

Original Article

J Korean Acad Prosthodont 2015;53(2):128-137.

Published online: 9 February 2015

DOI: https://doi.org/10.4047/jkap.2015.53.2.128

An occlusal contact analysis of lateral mandibular movement using T-Scan system

Joo-Hun Song, Se-Jin Joo, Ho-Sun Lee, Dong-Wan Kang, Gyeong-Je Lee^∗

Department of Prosthodontics, School of Dentistry, Chosun University, Gwangju, Republic of Korea

^∗Corresponding Author: Gyeong-Je Lee Department of Prosthodontics, School of Dentistry, Chosun University, 303 Pilmun-daero, Dong-gu, Gwangju 501-825, Republic of Korea +82 62 220 3827: e-mail, lkj1998@chosun.ac.kr

^※ This study was conducted with the research grant of Chosun University Dental Hospital in 2014.

Received 23 February 20156 April 2015 Accepted 8 April 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

Most of the former studies about the occlusal contact patterns during the mandibular movement focused on foreigner. The purpose of this study is analyzing the occlusal contacts of young Koreans by using T-Scan system.

Materials and methods

The sample size was 87 and the occlusal contacts of each right and left lateral movements were measured from the maximum intercuspation to the 3mm excursive position for three times respectively. All of the occlusal contacts were double checked through the thin metal foil. The results were categorized as two; 1) considering occlusal contact patterns on working side only, 2) considering occlusal contact patterns on working and nonworking sides.

Results

The results showed that the nonworking side occlusal contacts play major roles in the lateral mandibular movement. In both cases of considering with and without the nonworking side occlusal contacts, the group function was the most prevalent. In the working side, the contacts were the most frequent in canine and the frequency of contacts was decreased as the distance was increased from canine to molar. In the nonworking side, the contacts were the most frequent in second molar. And the gender factor was statistically significant (α =.05), as females have more nonworking side occlusal contacts in this study.

Conclusion

Among the three factors of anterior guidance, the group function was the most dominant factor. The analysis of 87 samples showed that canine contact was the most frequent in the working side and second molar contact was the most common in the nonworking side.

Keywords: T-Scan system, Canine protection, Group function, Working side occlusal contacts, Nonworking side occlusal contacts

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Fig. 1.

T-Scan system. (A) T-Scan sensor & Handle, (B) Application of T-Scan system.

Fig. 2.

Classification of occlusal contact patterns in the system 1 (considering occlusal contact patterns on working side only). (A) Canine protection,(B) Group function, (C) Unclassifiable pattern.

Fig. 3.

Classification of occlusal contact patterns in the system 2 (considering occlusal contact patterns on working and nonworking sides). (A) Canine protection (without nonworking side contacts), (B) Group function (without non-working side contacts), (C, D) With working & nonworking side occlusal contacts, (E) Unclassifiable pattern.

Fig. 4.

Result of T-Scan analysis in the system 1. (A) Canine protection, (B) Group function, (C) Unclassifiable pattern.

Fig. 5.

Result of occlusal contact patterns in the system 1 (n=87).

Fig. 6.

Distribution of occlusal contacts on working side (n=343).

Fig. 7.

Result of T-Scan analysis in the system 2. (A) Canine protection (without nonworking side contacts), (B) Group function (without nonworking side contacts), (C, D) With working & nonworking side occlusal contacts, (E) Unclassifiable pattern.

Fig. 8.

Result of occlusal contact patterns in the system 2 (n=87).

Fig. 9.

Distribution of occlusal contacts on nonworking side (n=62).

Table 1.

Participants in this study

	Number	Mean age (year)
Male	57	30.6
Female	30	28.7
Total	87	29.9

Table 2.

Percentage of nonworking side occlusal contacts (n=87)

Without nonworking side occlusal contacts	48 (55.2%)
With nonworking side occlusal contacts	Working & nonworking side contacts	35 (40.2%)	39 (44.8%)
With nonworking side occlusal contacts	Only nonworking side contacts	4 (4.6%)	39 (44.8%)

Table 3.

Nonworking side occlusal contact frequency according to the gender

	Female	Male	Total	x²
With nonworking side contacts	18	21	39
Without nonworking side contacts	12	36	48	4.262
Total	30	57	87	(df=1)

n=87, Chi-square test

P-value=.039, α =.05, Odd ratio=2.571

Table 4.

Nonworking side occlusal contact frequency according to the Angle’ s classification

	Angle’ s classification I	Angle’ s classification II, III	Total	x²
With nonworking side contacts	29	10	39
Without nonworking side contacts	38	10	48	0.281
Total	67	20	87	(df=1)

n=87, Chi-square test

P-value=.596, α =.05

Table 5.

Nonworking side occlusal contact frequency according to the experience of orthodontic treatment

	Experience	No Experience	Total	x²
With nonworking side contacts	9	30	39
Without nonworking side contacts	20	28	48	3.346
Total	29	58	87	(df=1)

n=87, Chi-square test

P-value=.067, α =.05

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